Simulation of semi-crystalline composites in the extrusion deposition additive manufacturing process

摘要: A UMATHT user subroutine was developed in Abaqus to combine a non-isothermal dual crystallization kinetics model with a statistical melting model in order to describe the simultaneous solidification/re-melting behavior of 3D printed parts during the Extrusion Deposition (ED) process. This subroutine is described in detail. Results indicate that crystallization behavior is significant and strongly dependent on the utilized polymer. As an outlook, the interaction with a second UMAT user subroutine that will be employed to predict residual stresses and deformations is explained. Recent developments in additive manufacturing have been made in ED. In order to improve stiffness and minimize warpage of printed parts, polymers with fiber reinforcement have gained special interest. Tools and molds are a promising application for this technology. In order to print carbon-fiber composite tooling, a high thermal stability of the …